Sen. Pat Toomey and his friends were prepared to introduce a balanced budget amendment this afternoon until it was abruptly postponed three hours before launch time. Why? The National Reviewreports this morning that Senate Minority Leader Mitch McConnell asked them to hold off until the entire Republican caucus is on board.

According to the article, McConnell wanted the group to work with the House and to ensure all 47 Senate Republicans were in support of it. An aide said the push would be more "powerful" that way.